This model is a bracket to mount a Commscope (formerly Arris) Touchstone CM8200 Cable Modem to an IKEA Skadis pegboard system. This modem is commonly used by the Australian National Broadband Network (NBN) for Hybrid Fibre Coaxial (HFC) connections.

Lugs on the bracket slot into grooves on either side of the modem, with the modem oriented horizontally or vertically.

Uses dtphantom's Skadis Dovetail Peg System (printed separately) to attach to the Skadis pegboard system - https://www.printables.com/model/283732-skadis-dovetail-peg-system.